Brake shoe assembly



Oct.12, 1948. c. EKSERGIAN ETAL 2,451,326

BRAKE SHOE ASSEMBLY 2 Shams-Sheet 1 Filed 00L 3, 1946 I N V EN TORSCarolus LQRsergLan.

Paul W. Cmemsle- ATTORNEY A TTORNE Y Oct. 12, 1948. c. L. EKSERGIAN ETALI BRAKE SHOE ASSEMBLY Filed Oct. 5, 1946 -2 Sheets-Sheet 2 m mmw a E WWl me N r3 [PKG L m m .2. I v m. mm R {w x u CP 1 v. F B

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[w y a Patented Oct. 1 2, 1948 Carolus L. Eksergian and Paul W.Gaenssle, De-

troit, Mich., assignors; to The Budd' Company,

Philadelphia, Pa., a corporation of Pennsylvania Application October 3,1946, Serial No. 700,948 7 Claims. (Cl. 188---234) 1 The inventionrelates to brake shoes and more particularly to such shoes having areadily detachable lining.

Usually such shoes comprise a rigid backing member to which thecomposition lining blocks or pads are directly secured. It has beenfound that with this arrangement, particularly in heavy duty braking,such as bringing modern high speed trains to a stop, it is almostimpossible to avoid high spots in the lining and consequently excessivelocalized pressures are developed between the lining and brake rotor,which may result in overheating of the braking face of the rotor inlocal-' ized areas and the development of heat checks, which may lead tocracking of the metal of the rotor and in excessive wear of the lining.

This efiect may happen even if the rotor is of the well knowncentrifugal blower type and the lining blocks are spaced both radiallyand cir-' cumferentially to provide passages between them for the flowof cooking air. I

In copending application'Serlal' No. 700,947, entitled Brake shoeassembly filed of even date herewith in the name of Paul W. Gae'nssle,there is disclosed a brake shoe in which the individual blocks areyieldingly mounted on the shoe backing and secured thereto so as to bereadily replaceable and to transmit the braking torque from therespective blocks to the shoe backing.

It is an object of the present invention to improve the shoe assembly,so as to facilitate its manufacture and provide for a more directtransmission of the torque from the blocks to the shoe backing, and tofacilitate the assembly of the blocks to the backing and provide for areadily detachable connection of the blocks to the backins.

These and other and further objects and ad,- vantages' and the manner inwhich they are attained will become fully apparent from the followingdetailed description when read in con-' nection with the drawingsforming a part of this specification.

In the drawings,

Figure 1 is a fragmentary side elevation of ashoe and cooperating brakerotor to which the invention has been shown applied;

Figure 6 is a view similar to Fig. 2 of a slightly modified arrangement;

Figure '1 is a detail sectional view similar to Fig. 5 of thismodification, the section being taken on the line l| of Fig. 6; and

Figure 8 is a perspective view of one of the lining pads or blockmounting stampings used in I the modified form of Figs. 6 and 7.

' 0 detachable means generally designated Figure 2 is a face view of theimproved shoe; I

will be understood that certain features thereof are also applicable toother types of brakes, and applicant does not wish to be limited to theprecise forms shown.

In the embodiment shown, the shoe proper, designated by the numeral III,is removably carried by a rigid mounting member ii which is, in turn,pivotally carried by a brake lever l2, through which it is pressedagainst the radial face of. a brake rotor, l3, all in a manner wellunderstood in the art. The shoe proper i! may comprise a rigid backingplate I seated against a similar fiat face on the mounting member and beengagement of an angularly extended end portion ii of said backingmember seated on a widened end portion l6 of the mounting member andreadily remov'ably secured in place by the adily 5' i1 which may besimilar to the such means disclosed inv copending application Serial No.579,223 filed February 22, 1945 for Brake assembly.

The main body of the backing plate I seated against'the flat face of themounting member II is of arcuate segmental form and the brake lining isremovably mounted on, the flat side of said plate opposite its sideseated on the mounting member.

This removable lining, according to the invention, comprises a pluralityof -circumferentially and radially spaced individual composition liningpads or blocks I8, shown in this instance to be six in number arrangedin three pairs of radially extending such blocks, see Figs. 2 and 4,

For convenience of manufacture and assembly,

the blocks are all mounted on a unitary sheet metal stamping l9 which isdivided by flexible radial connecting portions 20 and flexiblecircumferential connecting portions 2!, into six shallow pan-likesections corresponding to the number of lining blocks and one of thelining pads or blocks is secured as by cementing to the bottom of eachof said sections.

aasnsae 22 on the sides of said stamping it opposite the lining blocksis, these shallow recesses being arranged to receive rubber orrubber-like pads 23 disposed between them and the adjacent flat face ofthe backing plate M of the shoe. For greater ease in forming thestamping II and to reduce the number of parts entering into thestructure, each radially arranged pair of blocks has the adjacent sideflanges of its respective recesses omitted, and a. single rubber pad I!of sub-- stantially the extent of the combined recesses is seatedtherein, see Figs. 2 and 3.

The flexible connecting portions 20 are narrowed and thus weakened so asto be more readily flexible by the arcuate cut-outs 24 on the oppositesides thereof and the same is true of the connecting portions 2i whichare narrowed and weakened by the circumferentially extending slots 28having rounded ends. This arrangement makes each pan-like sectionmounting an individual lining block is free to have slight universaltilting movement independent of the other sections, by reason shown asdiffering slightly in their construction.

the end ones 24 havinga projecting annular flange II on their heads andthe intermediate ones fl having the head formed with an annular groove31. This diflerence in construction is primarily to facilitate theassembly of the end sections whichhave a rounded cut out It fitting theadjacent reduced portions of the heads andprojecting under theassociated flange II on said reduced portion of the head, without usingadditional securing means on said end projections 34. The tabs 82engaging the intermediate projections 30 have rounded cut outs llsimilar to the end tabsbut, since theseintermediate heads are notprovided with a flange, they can be readily moved downwardly over theheads, and are there locked in place. as by a bent wire spring clip llhaving its free end portions spring-pressed to lockuinto the annulargroove 31 and to securely hold the ends of the adjacent sections inplace,

of the rubber backing 23 and the nature of the I means securin thestampin to the backin g g g :5 directions entirely independently of theother member I, which means will now be described.

The connecting members 20, as is clearly shown in Fig. 5, are offsetslightly toward the backing member I and tapered end tabs 20, one oneach pan-like section disposed adjacent the ends of rubber-like pads areof an extent which prevents the stamping, are similarly oflset.Centrally of each of the connecting members 2. and centrally of the endtabs 26 are provided holes adapted to freely receive correspondinglyspaced projections 21 on the backing member it, these projectionscoacting with the stamping to transmit the braking torque from thelining blocks ll through the stamping is to the backing plate II.

To readily removably secure the lining in place on the backing member Iwith the rubber or rubber-like pads 23 under compression, each of theprojections (which are preferably headed studs riveted withincountersunk openings in the backing plate as clearly shown in Fig. 5)has its head formed with a transverse hole 28 and wires, as 29, arepassed through the holes of adjacent radially spaced projections andbent over in their projecting ends to lock them in place. Thisarrangement provides a very convenient means I for readily removablysecuring the cushioned lining to the brake shoe backing H.

The localized central connection of the flexible connecting member 20and the tabs 2' provided by the projections 21 and cooperating wires 2|permits all the freedom necessary to allow the individual blocks to tiltslightly in all directions. and thus insure equalized braking pressurethereon per unit of area and thereby the avoidance of localizedoverheating with the possibility of heat checks in the braking rotor.

According to the modification shown in Figs. 8 to 8, in which like partsare designated by corresponding reference numerals, the manner ofsecurement of the pan-like stamping sections ll is very similar to thatshown in the preferred form, but in this modification the pan-likestamping sections are entirely separate from each other and eachprovided with lateral side flanges 3| and oflset tapered end tabs 22,for securing them individually to the backing. Each stamping section 30carries, as in the preferred form, an individual composition liningblock II, and in the shallow recess formed on the side thereof oppositeI said block, it receives an individual rubber or rubber-like pad 33,Fig. 7.

The riveted projections are, in this instance.

braking pressure.

see Fig. 8. k

It will be seen that, in this modification, as in the preferred form.each lining block is relatively free to tilt under the braking pressurein all blocks, and the torque is transmitted to the projections in amanner entirely similar to the preferred form. r

In both forms, it is desirable that the rubber or them from entirelyfilling the associated recesses, so that room for expansion is providedfor the relatively incompressible pads to allow them to yield tothetilting movement of the blocks under They are of a thickness, ofcourse, which holds the stamping or stampings I carrying the blocksspaced some distance from the flat face of the backing plate Also, byreason of the offset of the connections 20 and 0 tabs 28 or I2 the outerends of the projections do not extend materially beyond the outer faceof the stamping section to which the lining blocks are secured, seeFigs. 5 and "I, so that substantially all of the lining may be worn awaybefore replacement is required. I I

While the invention has herein been described as embodied in severaldetailed forms, it will be understood that changes and modifications maybe made by those skilled in the art without departing from the mainfeatures of the invention, and such changes and modifications areintended to be covered in the appended claims.

What is claimed is:

l. A brake shoe for cooperation with a brake rotor, comprising anarcuatebacking member to receive the brake-applying thrust and having a flatface on the side thereoi opposite the one receiving said thrust. and apressed metal element removably secured to the flat face of said backingmember and being formed with a shallow recess on the side thereof towardsaid flat face. and a rubber-like cushioning pad received in saidshallowrecess and compressed between said-element and said flat face orthe backing member, the side of said pressed metal element opposite saidrecessed side having secured thereto a composition brake lining, andsaid removable securing means including a projection from said flat'facefor transmitting the braking torque from said element to said backing.

2. A brake shoe for cooperation with a brake rotor, comprising anarcuate backing member to receive the brake-applying thrust and having athe one receiving the thrust. and a removable pressed metal menaceelement of substantially the extent of said flat face of the backingmember, and having circumferentlaliy spaced shallow recesses on the sidethereof toward said flat face, similarly spaced rubber-like cushioningpads received in said shallow recesses and compressed between saidelement and said flat face of the backing member, the side of saidpressed metal element opposite saidrecessed side having secured theretosimilarly spaced composition brake blocks, and securing means arrangedadjacent the ends of said element and intermediate saidcircumferentiallyspaced recesses for compressing said rubber-likecushioning pads and transmitting the braking torque to said backingmember.

3. A brake shoe for cooperation with a brake rotor, comprising anarcuate rigid backing member to receive the brake-applying thrust andhaving a flat face on the side thereof opposite the one receiving saidthrust, and a brake .lining' readily detachably secured to said fiatface, said lining comprising a plurality of circumferentially andradially spaced composition lining blocks secured to sheet metal backingmeans, said backing means being formed with shallow recesses on the sidthereof opposite the lining blocks and each being of an extent at leastsubstantially equal to the extent of one of said blocks, andrubber-likecushioning pads received in said recesses, the readily detachablesecuring means connecting said sheet metal backing means to said rigidbacking member so as to compress the rubber-like pads and includingprojections from said flat face to transmit the braking torque to saidrigid backing member.

4. A brake shoe for cooperation with a brake equal to the extent of oneof said blocks, and rubber-like cushioning pads received insaid-recesses. the readily detachable securing means compressing therubber-like pads. allowing slight tilting, in all directions, of saidlining blocks and transmitting the braking torque to said rigid backingmember, the securing means being disposed at the respective ends of saidelement and between the circumferentially-spaced lining blocks andcomprisingposts on the arcuate backing member extending slightly abovethe portions of said element flanking said recesses, and meanscoopcrating with said posts for securing the element in place.

6. A brake shoe for cooperation with a brake rotor, comprising anarcuate backing member to receive the brake-applying thrust and having aflat face, on the side thereof opposite the one receiving said thrust,conforming to the opposed face of the rotor, and a brake lining readilydetachably secured to said flat face, said lining comprisingcircumferentially and radially spaced composition lining blocks securedto a sheet metal backing element of substantially the extent of saidarcuate backing member, said element being formed with shallow recesseson the side thereof opposite the lining blocks and weakenedcircumferentially and radially between the blocks, and

rotor, comprising an arcuate backing member to a receive thebrake-applying thrust and having a flat face, on the side thereofopposite the one receiving said thrust, conforming to the opposed faceof the rotor, and a pressed metal element readily detachably secured tothe flat face of the backing member and being formed with a shallowrecess on the side thereof toward said face. and a rubber-likecushioning pad received in said shallow recess and compressed betweensaid element and said flat face of the backing member. the side of saidpressed metal element opposite said recessed side having secured theretoa composition brake lining. and said readily detachable securing meanspermitting slight tilting of said lining in all directions and includingprojections from said face transmitting the braking arque from saidelement to said backing mem- 5. A brake shoe for cooperation with abrake rotor, comprising an arcuate backing member to receive thebrake-applying thrust and having a flat face on the side thereofopposite the one receiving said thrust and a brake lining readilydetachably secured to said flat face, said lining comprising a pluralityof circumferentially and radially spaced composition lining blockssecured to a sheet metal backing element of substantially the extent ofsaid arcuate backing member, said element being formed with shallowrecesses on the side thereof opposite the lining blocks and each beingof an extent at least substantially rubber-like cushioning pads receivedin said re- .cesses, the readily detachable securing means loa flat faceon the side thereof opposite the one receiving said thrust, and apressed metal element, removabiy secured to the flat face of saidbackingmember and being formed with a shallow recess in the side thereoftoward said flat face.- and a rubber -like cushioning pad received insaid 'the flat face of said backing member engaging said extensions totake the braking torque, and

H readily removable means engaging said projections for maintaining saidextensions in engagement with said projections and the rubber-like padunder compression.

CAROLUS L. EKSERGIAN. PAUL W. GAENSSLE.

REFERENCES crrnn The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 362,773 Neichter May 10, 188'?2,288,311 Eksergian Mar. 25, 1941

